#pragma once

#include <iostream>
#include <string>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <cstdlib>
#include "Common.hpp"
#include "Log.hpp"
#include "InetAddr.hpp"

namespace SocketModule
{
    using namespace LogModule;


    const static int gbacklog = 16;
    class Socket
    {
    public:
        virtual ~Socket() {}
        virtual void SockOrDie() = 0; // 纯虚函数 这个函数没有默认实现，子类必须自己写
        virtual void BindOrDie(uint16_t port) = 0;
        virtual void ListenOrDie(int backlog) = 0;
        virtual std::shared_ptr<Socket> Accept(InetAddr *client) = 0;
        virtual void Close() = 0;
        virtual int Recv(std::string *out) = 0;
        virtual int Send(const std::string &message) = 0;
        virtual int Connect(const std::string &server_ip, uint16_t port) = 0;

    public:
        void BuildTcpSocketMethod(uint16_t port, int backlog = gbacklog)
        {
            SockOrDie();
            BindOrDie(port);
            ListenOrDie(backlog);
        }
        void BuildTcpClientSocketMethod()
        {
            SockOrDie();
        }
    };

    // class UdpSocket : public Socket
    // {
    // };

    const static int defaultfd = -1;
    class TcpSocket : public Socket
    {
    public:
        TcpSocket() : _sockfd(defaultfd)
        {
        }
        TcpSocket(int fd) : _sockfd(fd)
        {
        }
        ~TcpSocket() {}
        void SockOrDie() override //重写父类的虚函数
        {
            _sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
            if (_sockfd < 0)
            {
                LOG(LogLevel::FATAL) << "create socket error";
                exit(SOCKET_ERR);
            }
            LOG(LogLevel::INFO) << "create socket success";
        }
        void BindOrDie(uint16_t port) override
        {
            InetAddr localaddr(port);
            int n = ::bind(_sockfd, localaddr.NetAddrPtr(), localaddr.NetAddrLen());
            if (n < 0)
            {
                LOG(LogLevel::FATAL) << "bind socket error";
                exit(BIND_ERR);
            }
            LOG(LogLevel::INFO) << "bind socket success";
        }
        void ListenOrDie(int backlog) override
        {
            int n = ::listen(_sockfd, backlog);
            if (n < 0)
            {
                LOG(LogLevel::FATAL) << "listen socket error";
                exit(LISTEN_ERR);
            }
            LOG(LogLevel::INFO) << "listen socket success";
        }
        std::shared_ptr<Socket> Accept(InetAddr *client) override
        {
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            int fd = ::accept(_sockfd, CONV(peer), &len);
            if (fd < 0)
            {
                LOG(LogLevel::WARNING)<< "accept warning...";
                return nullptr;
            }
            //????
            client->SetAddr(peer);
            return std::make_shared<TcpSocket>(fd);
        }
        int Recv(std::string *out) override
        {
            char buffer[1024];
            ssize_t n = ::recv(_sockfd,buffer,sizeof(buffer)-1,0);
            if(n>0)
            {
                buffer[n] = 0;
                *out += buffer;
            }
            //??
            return n;
        }
        int Send(const std::string& message) override
        {
            return send(_sockfd,message.c_str(),message.size(),0);
        }
        void Close() override
        {
            //合法
            if(_sockfd >0)
            ::close(_sockfd);
        }
        int Connect (const std::string& server_ip,uint16_t port) override
        {
            InetAddr server(server_ip,port);
            //成功时返回0 失败时返回-1，并设置errno 常用于TCP客户端建立与服务器的连接
            return ::connect(_sockfd,server.NetAddrPtr(),server.NetAddrLen());
        }

    private:
        int _sockfd; // _sockfd , listensockfd, normal_sockfd;
    };
}